Comments on: In scuba diving what keeps the pressurized air from becoming too cold to breathe? http://www.servantsofallah.org/scuba/in-scuba-diving-what-keeps-the-pressurized-air-from-becoming-too-cold-to-breathe Explore the nice oceans Sun, 18 Oct 2009 03:45:59 +0000 hourly 1 By: chris http://www.servantsofallah.org/scuba/in-scuba-diving-what-keeps-the-pressurized-air-from-becoming-too-cold-to-breathe/comment-page-1#comment-531 chris Tue, 13 Oct 2009 23:46:59 +0000 http://www.servantsofallah.org/scuba/in-scuba-diving-what-keeps-the-pressurized-air-from-becoming-too-cold-to-breathe#comment-531 When you take a breathe from your tank, the high pressure air is converted to medium pressure by the first stage of your regulator (the bit that fits on the tank). The mouth piece transfers this air to your mouth at ambient pressure. If the high pressure air came straight into your mouth, it'd blow your 'ead off(ish). If you open the valve on a tank (check with the staff that you can waste a tank) fully and leave it to empty a 3000psi tank, once it's near empty, feel the valve, you'll find it's pretty bloody cold, so you're kinda right that when gases go from high pressure to low pressure (according to Charles' law:at a constant pressure, the volume occupied by a given quantity of gas decreases as the temperature of the gas decreases (p1v1/t1=p2v2/t2) but the volume of the tank remains unchanged, the temp decreases.<br><b>References : </b><br> When you take a breathe from your tank, the high pressure air is converted to medium pressure by the first stage of your regulator (the bit that fits on the tank). The mouth piece transfers this air to your mouth at ambient pressure. If the high pressure air came straight into your mouth, it’d blow your ‘ead off(ish). If you open the valve on a tank (check with the staff that you can waste a tank) fully and leave it to empty a 3000psi tank, once it’s near empty, feel the valve, you’ll find it’s pretty bloody cold, so you’re kinda right that when gases go from high pressure to low pressure (according to Charles’ law:at a constant pressure, the volume occupied by a given quantity of gas decreases as the temperature of the gas decreases (p1v1/t1=p2v2/t2) but the volume of the tank remains unchanged, the temp decreases.
References :

]]> By: realramona http://www.servantsofallah.org/scuba/in-scuba-diving-what-keeps-the-pressurized-air-from-becoming-too-cold-to-breathe/comment-page-1#comment-530 realramona Tue, 13 Oct 2009 23:13:59 +0000 http://www.servantsofallah.org/scuba/in-scuba-diving-what-keeps-the-pressurized-air-from-becoming-too-cold-to-breathe#comment-530 With scuba tanks, the only thing in the tank is the same air you're breathing right now. Refrigeration (on the other hand) uses gases such ammonia or freon to create this cooling reaction. In other words, with refrigeration, it's engineered to get cooler. With scuba diving, we don't need that extra engineering. In fact, it's very dangerous to divers if anything BUT regular air ends up in the tank. If you want to know a whole lot more about how scuba compressors work, check out the link below.<br><b>References : </b><br>http://www.neptunoworld.com/articles/compressors.html With scuba tanks, the only thing in the tank is the same air you’re breathing right now. Refrigeration (on the other hand) uses gases such ammonia or freon to create this cooling reaction.

In other words, with refrigeration, it’s engineered to get cooler. With scuba diving, we don’t need that extra engineering. In fact, it’s very dangerous to divers if anything BUT regular air ends up in the tank.

If you want to know a whole lot more about how scuba compressors work, check out the link below.
References :
http://www.neptunoworld.com/articles/compressors.html

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